Consolidate tabs, Quick Access links, mini player nav, link descriptions

- Merge Scripts/Callbacks/Links tabs into single Settings tab with collapsible sections
- Rename Actions tab to Quick Access showing both scripts and configured links
- Add prev/next buttons to mini (secondary) player
- Add optional description field to links (backend + frontend)
- Add CSS chevron indicators on collapsible settings sections
- Persist section collapse/expand state in localStorage
- Fix race condition in Quick Access rendering with generation counter
- Order settings sections: Scripts, Links, Callbacks

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

media_server/static/css/styles.css

@@ -42,6 +42,7 @@
 :root[data-theme="light"] .browser-container,
 :root[data-theme="light"] .scripts-container,
 :root[data-theme="light"] .script-management,
+:root[data-theme="light"] .settings-section,
 :root[data-theme="light"] .display-container {
     box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
 }
@@ -979,6 +980,91 @@ button:disabled {
     color: var(--text-primary);
 }
 
+/* Settings Container */
+.settings-container.active {
+    display: flex;
+    flex-direction: column;
+    gap: 1rem;
+}
+
+.settings-section {
+    background: var(--bg-secondary);
+    border-radius: 12px;
+    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
+    overflow: hidden;
+}
+
+.settings-section summary {
+    padding: 1rem 1.5rem;
+    font-size: 1rem;
+    font-weight: 600;
+    color: var(--text-primary);
+    cursor: pointer;
+    user-select: none;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    transition: background 0.2s;
+    list-style: none;
+}
+
+.settings-section summary::-webkit-details-marker {
+    display: none;
+}
+
+.settings-section summary::before {
+    content: '';
+    display: inline-block;
+    width: 0.5rem;
+    height: 0.5rem;
+    border-right: 2px solid var(--text-muted);
+    border-bottom: 2px solid var(--text-muted);
+    transform: rotate(-45deg);
+    transition: transform 0.2s;
+    flex-shrink: 0;
+}
+
+.settings-section[open] > summary::before {
+    transform: rotate(45deg);
+}
+
+.settings-section summary:hover {
+    background: var(--bg-tertiary);
+}
+
+.settings-section-content {
+    padding: 0 1.5rem 1.5rem;
+    overflow-x: auto;
+}
+
+.settings-section-description {
+    color: var(--text-secondary);
+    font-size: 0.875rem;
+    margin-bottom: 1rem;
+}
+
+/* Link card in Quick Access */
+.link-card {
+    text-decoration: none;
+    color: var(--text-primary);
+    border: 1px dashed var(--border);
+}
+
+.link-card:hover {
+    border-style: solid;
+}
+
+/* Mini player nav buttons */
+.mini-nav-btn {
+    width: 28px;
+    height: 28px;
+}
+
+.mini-nav-btn svg {
+    width: 16px;
+    height: 16px;
+}
+
 /* Display Control Section */
         .display-container {
             background: var(--bg-secondary);